Science lesson plan · 8th grade (Year 9 in England) · 45 minutes
What acids make with metals and carbonates
Chemical reactions, acids and bases
CCSS NGSS.MS-PS1-2England: KS3 Chemistry: Acids and alkalisEngland: GCSE Combined Science: Chemical changes
Objective and success criteria
Students will: What acids make with metals and carbonates.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: Acids, alkalis (bases) and the pH scale; Reactants, products and word equations
Leads to: Identify gases with laboratory tests
Materials: Teacher demo or video, Indicator color chart, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).
Warm-up · 5 min
- Quick retrieval from earlier learning (Acids, alkalis (bases) and the pH scale; Reactants, products and word equations). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Complete the word equation: iron + oxygen → ___ (iron carbonate / iron chloride / carbon dioxide / iron oxide) → iron oxidePrompt: A metal reacting with oxygen makes a metal oxide.
- Universal indicator turns red in a solution. What does this tell you? (It is a strong acid / It is pure water / It is a strong alkali / It is neutral) → It is a strong acidPrompt: Red is at the low-pH end of the colour chart.
- Complete the word equation: calcium + oxygen → ___ (magnesium oxide / carbon dioxide / calcium oxide / calcium chloride) → calcium oxidePrompt: A metal reacting with oxygen makes a metal oxide.
Hook · 5 min
- Drop an antacid tablet in water (or show a clip) and ask whether a new substance is being made.
- Share the objective: What acids make with metals and carbonates. Read the success criteria together.
I do: model it · 10 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: Zinc reacts with sulfuric acid. What are the products?
- Step 1: sulfuric acid makes sulfate salts.
- Step 2: So the answer is: zinc sulfate + hydrogen
- Answer: zinc sulfate + hydrogen
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 10 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- Calcium reacts with sulfuric acid. What are the products? (calcium chloride + hydrogen / calcium sulfate + carbon dioxide / calcium sulfate + hydrogen / calcium nitrate + hydrogen) → calcium sulfate + hydrogenPrompt: acid + metal → salt + hydrogen
- Calcium carbonate reacts with sulfuric acid. What are the products? (calcium sulfate + water + carbon dioxide / calcium sulfate + hydrogen / calcium oxide + carbon dioxide / calcium sulfate + water) → calcium sulfate + water + carbon dioxidePrompt: Carbonates fizz with acids. Which gas turns limewater cloudy?
You do: independent practice · 10 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 8 questions are on the student sheet below, with answers in the key.
Exit ticket · 5 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- Calcium reacts with nitric acid. What are the products? (calcium nitrate + hydrogen / calcium nitrate + water / calcium sulfate + hydrogen / calcium oxide + hydrogen) → calcium nitrate + hydrogenPrompt: acid + metal → salt + hydrogen
- Acid rain slowly damages limestone and marble statues. Why? (Rain makes them grow / They are made of iron / They are calcium carbonate, which reacts with acids / They are alkali metals) → They are calcium carbonate, which reacts with acidsPrompt: What do carbonates do with acids?
Watch out for
- Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
- Remembering facts without the reason: ask "why?" and "what is the evidence?"
Support and stretch
Support
- Review first: Acids, alkalis (bases) and the pH scale.
- Use concrete materials: teacher demo or video.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Move on to: Identify gases with laboratory tests.
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-8.
Free lesson plan from eurekami.com/lesson-plan-builder